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diff --git a/prolog/problems/family_relations/sister_2/en.py b/prolog/problems/family_relations/sister_2/en.py
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+++ b/prolog/problems/family_relations/sister_2/en.py
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+id = 96
+name = 'sister/2'
+slug = 'the sister relation'
+
+description = '''\
+<p><code>sister(X, Y)</code>: <code>X</code> is a sister of <code>Y</code>.</p>
+<pre>
+  ?- sister(vanessa, X).
+    X = patricia.
+</pre>'''
+
+hint = {}